CN1926890A

CN1926890A - Signal transmission method and system of base station based on radio frequency remote

Info

Publication number: CN1926890A
Application number: CNA2004800423161A
Authority: CN
Inventors: 刘晟
Original assignee: UTStarcom Telecom Co Ltd
Current assignee: UTStarcom Telecom Co Ltd
Priority date: 2004-04-09
Filing date: 2004-04-09
Publication date: 2007-03-07
Anticipated expiration: 2024-04-09
Also published as: US20070195832A1; WO2005099282A1; EP1742494A1; CN100544457C; JP2007533179A; US7822075B2

Abstract

The present invention relates to a method and a base station communication system for signal transmission between a main base station and one or more remote radio units. Wherein a transmission channel between the master base station and the one or more remote radio units communicates using a broadband transmission link or network, the method comprising the steps of: and the digital wireless signal data stream and the inband control signaling stream thereof transmitted on the transmission channel are formed into a GFP frame of a general framing procedure and are further mapped into an STM-N/OTM-N frame, so that the digital wireless signal data stream and the inband control signaling stream are multiplexed to realize the transmission based on the SDH/OTN. Therefore, effective wireless signal transmission can be realized between the remote radio frequency unit and the main base station without a special transmission network, and the management and maintenance operation of signal transmission and the network construction cost are reduced.

Description

Method and system of signal transmission based on radio frequency stretch base station

Base station based on remote radio

Method for transmitting signals and systems technology field

The present invention relates to the station technology in GSM, more particularly to a kind of method for transmitting signals and system in the base station system zoomed out using radio frequency unit.Background technology

1. radio frequency unit remote technology, centralized base station and signal transmission

In mobile communication system, wireless access network is typically by base station（BTS) and for controlling the base station controllers of multiple base stations（) or radio network controller BSC（RNC) constitute, as shown in Figure 1A, wherein, base station mainly by baseband, radio frequency (；RF) unit such as subsystem and antenna is constituted, and is responsible for completing the transmitting of wireless signal, is received and handle, and a base station can cover different cells by multiple antennas, as shown in Figure 1B.

In mobile communication system, the more scabrous wireless network covering problem of traditional base station technology, a kind of more effective scheme that radio frequency unit remote technology is exactly proposed for this problem are used in the presence of the in-door covering of skyscraper, blind area or the covering in shadow region etc..In the base station system zoomed out using radio frequency unit, main radio frequency unit and antenna is installed in the region for needing to provide covering, and is connected to by broadband transmission link other units of base station.

The technology can be further development of the centralized base station technology zoomed out using radio frequency unit.Compared with traditional base station, the centralized base station that this use radio frequency unit is zoomed out has many advantages：Allow to substitute a macrocell based on traditional base station using multiple Microcells, so as to better adapt to different wireless environments, improve the wireless performances such as capacity and the covering of system；The structure of centralization allows the soft handover in traditional base station to be completed with More Soft Handoff, so as to obtain extra processing gain；The structure of centralization also causes costliness Base band signal process resource turn into resource that multiple cells share so as to obtain the benefit of statistic multiplexing, lower system cost.The applying date is the United States Patent (USP) US 5 in March 23 nineteen ninety-five, 657, 374, entitled " Cellular system with centralized base stations and distributed antenna units ", and the United States Patent (USP) US 6 that the applying date is on June 28th, 1999, 324, 391, entitled " Cellular communication with centralized control and signal processing, , Deng the relevant details of realizing for disclosing centralized base station this technology zoomed out using radio frequency unit, the document is quoted from as reference herein.

As shown in Fig. 2 the centralized base station systems 200 zoomed out using radio frequency unit are by the center channel processing subsystem 201 installed concentratedly and multiple long-distance radio frequency units（ RRU )

2041,2042,204M compositions, are connected by broadband transmission link or network between them.Center channel processing subsystem 201 is main to be made up of channel reason resource pool 202 and the grade functional unit of signal route assignment unit 203, wherein, channel processing resource pond

202 are formed by multiple 202N of channel bank 2021,2022 stackings, and for completing the work such as base band signal process, signal route assignment unit 203 is then according to each cell business volume（Traffic difference), dynamically distributes channel processing resource realizes the effectively shared of multiple cell process resource.Signal route assignment unit 203 can also be realized in addition to being realized as shown in Figure 2 inside centralized base station as single equipment outside centralized base station.Long-distance radio frequency unit 2041,2042,204M is main (in figure not completely shown with functional units such as anti-antennas by the radio-frequency power amplifier of transmission channel, the low-noise amplifier of receiving channel）Constitute.The link of center channel processing subsystem 201 and long-distance radio frequency unit 2041,2042,204M typically can be using transmission mediums such as optical fiber, copper cable, microwaves.

In the base station system that above-mentioned two class is zoomed out using radio frequency unit, key needs to solve long-distance radio frequency unit（RRU) the transmission of wireless signals problem between master base station, wherein, the general designation of other base station units in the Ji Zhan Xi System that master base station is above-mentioned two class to be zoomed out using radio frequency unit beyond radio frequency unit including baseband processing unit.Typically use mould Intend intermediate frequency or analog radio-frequency signal transmission plan, realize and be relatively easy to although with analog signal transmission scheme, but, analog line will necessarily be mixed into the interference components such as noise, and the signal modulation in transmission can also introduce non-linear distortion, in addition, analogue transmission make it that transmission line utilization rate is low, also the implementation of Large Copacity multiplexing technique is not easy to, therefore, analogue transmission scheme is difficult to use in large-scale network-estabilishing.

Therefore, in the Chinese patent application CN1464666 that the applying date is on June 11st, 2002, entitled " a kind of soft base station system and its synchronous method based on fiber optic stretch " and the applying date are on July 2nd, 2003（Priority is on July 2nd, 2002）Chinese patent application CN1471331, entitled " base station system of mobile communication " etc., it is proposed that using the embodiment of digital data transmission, in order to reduce the demand of transmission bandwidth as far as possible, generally uses digital baseband signal transmission plan.Wherein, CN1464666 disclose only between RRU and master base station using optical fiber transmission numeral I/Q (inphase/orthogonals）The straightforward procedure of baseband signal, i.e., by number space I/Q baseband signals be serial data stream through parallel-serial conversion in transmitting terminal, be sent to receiving terminal through optical transmitter, receiving terminal recovers numeral I/Q baseband signals after being received through optical receiver through serioparallel exchange；CN1471331 proposes a kind of physical layer and uses ethernet technology, but does not use ethernet mac (medium education）The transmission technology of frame and the specifically defined successive bits ^ forms of use.At present, the cooperative association of an entitled CPRI (Common public Radio Interface) is also being engaged in the standardization effort that digital baseband is passed between RRU and master base station, and its technical specification can be from network address http://www.cpri.info/spec.html is obtained, the specification employs the technology similar with CN1471331, i.e. physical interface uses gigabit or 10GB ethernet standards, form is filled in upper strata using customized successive bits $, but CPRI only supports point-to-point star net forming mode, CN1471331 can then support the link based on hub to assemble.

On the other hand, SDH (SDHs）And based on DWDM (dense wave division multipurpose）OTN (the optical transfer networks of the wavelength-division multiplex techniques such as/CWDM (coarse wavelength division multiplexer)）In backbone network and broadband metropolitan area network（MAN it has been widely used in), But between existing RRU and master base station in digital transmission technology, what is used is all special host-host protocol and specification, because of jt an ancient type of spoons, it is difficult by existing ripe broadband transmission resource in existing telecommunication transmission net, so as to add network construction cost, in addition, digital transmission technology also Cun Group nets are dumb between existing RRU and master base station, the problems such as maintenance management is complicated.

2. Generic Framing Procedure (GFP)

Generic Framing Procedure（GFP) be ITU-T and ANSI combine recommendations be used for block is encoded or packet type data ' stream is fitted to continuous byte of sync transmission channel, typically such as SDH (SDH), OTN (optical transfer networks）Deng new technology, its detailed technical specification refer to ITU-T standard G.7041 or ANSI mark hardly possible T1X1.5/2000-024R3, institute's it specifications quote from as reference herein.GFP points are support PDU (protocol Data Units）The frame mapping GFP (GFP-F) and the transparent GFP (GFP-T) of Zhi Chi Boundless type of codings, wherein GFP-F of type can be used for PPP (peer-peer protocols）, MPLS (discuss Tag switching more）And ethernet mac (medium education）Suitable etc. protocol packet, GFP-T is then used for the block code character stream of the directly circuit such as adaptation gigabit Ethernet, therefore, can meet the requirement of some delay requirements very small application, but it is relatively low to compare the defeated bandwidth availability ratios of GFP-F.

In accompanying drawing 3, signal ' the raw frame structures for showing a GFP-T type of I ".

GFP-T frames are by core head（Core header) and payload part composition, wherein payload part is again including payload header, the anti-optional payload FCS (Frame Check Sequences of payload）, core head is by the PLI fields of instruction payload length with core head Error Control field cHEC knobs into cHEC is played and ATM (asynchronous transfer modes in addition to the effect of error protection is provided for core head, also）Believe that ^ L delimit the effect that similar gfp frame is delimited.The effect of payload header is the type for indicating payload, and provides error protection by tHEC, wherein, Payload Type Identifier（PTI) represent that the GFP-T frames carry user data for " 000 ", be that " 100 " represent the frame carrying client management information, payload FCS lance purports are shown（PFI) it is used to indicate whether there is payload FCS, user's payload mark（UPI) with PTI is used for the type for representing Fishing user data or customer account management information in payload together, as shown in table 1, table 2.

Table 1

Table 2

PTI = 100

UPI value gfp frame payloads

0000,0000,1111,1111 retain without

0000,0001 client signal fails（Lost loses client signal）

0000,0010 client signal fails（Lose client characters synchronous）

0000,0011,1111,1110 is in the future using reservation In addition, optional extended head whether there is and its type is identified by extended head

(EXI) represent, one of current extended head play the client signal that type application is to provide channel logo (CID) to support multichannel independence multiplexing.The payload of GFP-T frames is the super block that prestige is organized by 64B/65B code blocks order of regular length（Super block), as shown in Figure 3, because current transparent mode GFP props up the block code character stream for connecing adaptation using 8B/10B line codings, therefore user data character and control character are included in 64B/65B code blocks, identifies in the 64B/65B code blocks whether include control character using a flag bit for this（Bit shown in Ll in Fig. 3, L2 .. Shang 8）, wherein, high 4 of control character are used for the instruction of subsequent control character and control station location marker of the loudspeaker code in former 8B/10B code streams, and low 4 are used for transmission control code in itself.

In order to ensure the transmission of client signal, the bandwidth of the transmission channel such as SDH/O TN should be slightly larger than the bandwidth needed for gfp frame, because each super block size of GFP-T frames is 536 bits, therefore the bit length of GFP-T frames is represented by：

L = L_{overhead +}536-N (1) wherein N is the super block number in GFP-T frames, L_overheadFor the length of the expenses such as GFP-T frame cores head, payload header and optional payload FCS, if former client signal rate is ^ bits per seconds, the a width of bits per second of band of the transmission channels such as SDH/OTN, client signal, the stream of 512 bits can be carried in view of each super block, therefore GFP-T frame super block numbers N should meet following formula：

L 5U - N

—— <

B_T B_cTherefore the minimum super block number N needed for meeting the GFP-T frames of above-mentioned condition should be (2):

Wherein symbol w represents the smallest positive integral more than or equal to x.

Virtual Concatenation 3. (VCAT) technology

STM-N/OTM-n standard transmission links in SDH/OTN are by the virtual container of some typical fixed rates（VC) then it is multiplexed according to certain multiplexing Λ.Basic virtual container such as SDH includes VC-11, VC-12, VC-2, VC-3 and VC-4, and VC-4 can also be by concatenated in order formation VC-4-4c, VC-4-16c, VC-4-64c and VC-4, the virtual container of tetra- kinds of higher rates of 256c, such as table 3 show.

Table 3

A limited number of fixed rate Virtual container techniques simplify SE>H multiplexing is designed and inserts score, multiplexing and the easy f of the operation such as digital construction are realized, but due to needing substantial amounts of filling to be adapted to specific VC speed, therefore also shadow efficiency of transmission.And Virtual Concatenation（VCAT) technology allows the virtual container of multiple phase same rates to provide more transmission bandwidths selections through inverse multiplexing, so as to solve the problems, such as efficiency of transmission ^, but is due to Each Virtual containers reach receiving terminal through independent transmission path, because Jt an ancient type of spoons need to deposit to eliminate the difference of propagation delay time in the certain Slow of receiving terminal progress.The content of the invention

To solve problem present in transmission of wireless signals between long-distance radio frequency unit and main website in the prior art, it is an object of the present invention to provide a kind of method for transmitting signals of wireless base station based on remote radio and system.By using there are existing bandwidth resources in telecommunication transmission net, the transmission technology of the prior art based on SDH/optical transfer network is particularly directly accessed between long-distance radio frequency unit and master base station, i.e., is directly used

STM-N/OTM-n standard interfaces, can realize that valid wireless signal is transmitted without special transmission network between long-distance radio frequency unit and master base station, reduce network construction cost.

Another object of the present invention be have using SDH/OTN ^ bodies perfect route protection and self-healing mechanism, flexible networking mode and into Network Management Function, the thus management of the signal transmission between cylinder long-distance radio frequency unit and master base station and attended operation.

According to an aspect of the present invention, propose a kind of method that signal transmission is carried out between a master base station and one or more long-distance radio frequency units, transmission channel between wherein described master base station and one or more of long-distance radio frequency units is communicated using broadband transmission link or network, the described method comprises the following steps：In the transmission channel biography Theory is carried out using SDH SDH/ optical transfer networks OTN, and turn into Generic Framing Procedure gfp frame by the digital wireless signal data flow transmitted in the transmission channel and its with control signaling manifold, and further it is mapped as STM-N/OTM-n frames, so as to be multiplexed the digital wireless signal data flow and the band control signaling flow, to realize the transmission based on SDH/OTN.

According to another aspect of the present invention, it is proposed that a kind of base earthen table communication system that signal transmission is carried out between a master base station and one or more long-distance radio frequency units, wherein institute The transmission channel stated between master base station and one or more of long-distance radio frequency units is communicated using broadband transmission link or network, and the base station communication system at least includes：One SDH SDH/ optical transfer network OTN communication interface, it is arranged in the transmission channel, for the digital wireless signal transmitted in the transmission channel data ^ and its band control signaling flow to be formed as into Generic Framing Procedure GFP frames, and further ^:Penetrate as STM-N/OTM-n frames, so that the digital wireless signal data flow and the band control signaling flow are multiplexed, to realize the transmission based on SDH/OTN.Brief description of the drawings

Considered by reference to the following drawings during the preferred embodiment of the present invention, the present invention may be better understood, wherein：

Figure 1A diagrammatically illustrates the structure of the wireless access network in normal mobile communication system；

Figure 1B diagrammatically illustrates the basic structure of base station system in normal mobile communication system；

Fig. 2 diagrammatically illustrates the structure of the centralized base station systems zoomed out using radio frequency unit；

Fig. 3, which is diagrammatically illustrated, is used for the GFP-T frame structures of block code character stream according to Generic Framing Procedure；

Fig. 4 A, 4B are diagrammatically illustrated to be transmitted according to what first embodiment of the invention was carried out between master base station and one or more long-distance radio frequency units based on SDH/OTN；Fig. 5 A, 5B diagrammatically illustrate carried out according to second embodiment of the invention between master base station and one or more long-distance radio frequency units realize defeated based on SDH/OTN；Fig. 6 A, 6B are diagrammatically illustrated to be transmitted according to what the embodiment of the mat woven of fine bamboo strips three of the present invention was carried out between master base station and one or more long-distance radio frequency units based on SDH/OTN；Fig. 7 A, 7B are diagrammatically illustrated to be transmitted according to what four embodiment of the invention was carried out between master base station and one or more long-distance radio frequency units based on SDH/OTN； Fig. 8 A, 8B are diagrammatically illustrated to be transmitted according to what fifth embodiment of the invention was carried out between master base station and one or more long-distance radio frequency units based on SDH/OTN；Fig. 9 is that the definition in control character transmission belt internal control, J signaling schemes on control character is utilized according to second embodiment of the invention；And

Figure 10 is the clock recovery and long-distance radio frequency unit timing according to the present invention.Embodiment

Below in conjunction with accompanying drawing, the embodiment to the present invention is described, and purpose, advantage, the beneficial effect of this hair will become more apparent upon.

As previously described, the present invention is for problem present in transmission of wireless signals between long-distance radio frequency unit and master base station in the prior art, propose a kind of branch art with existing telecommunication transmission net it is compatible, digital wireless signal transmission technology between the RRU of existing SDH/OTN transmission networks and master base station can be directly accessed, the STM-N/OTM-n standard interfaces of net are stolen due to directly being passed using SDH/OTN, are that digital wireless signal between RRU and master base station can be achieved to transmit without special transmission network.

Because SDH/OTN has the Network Management Function of perfect route protection and self-healing mechanism, flexible networking mode and maturation, therefore the cylinder management that signal is transmitted between RRU and master base station and attended operation significantly in itself.Further, since SDH has progressively been evolved to the MSTP (multi-service transport platforms with multi-service transportation function）Network, therefore, using the invention enables can be completed between the node of each in wireless access network using same transmission network, including between RRU and master base station, between BTS and BSC/RNC, and between BTS and BTS（A kind of new construction of wireless access network）Data transfer, so as to greatly reduce the complexity and cost of networking, networking flexibility denier is easy to maintain.

Between RRU and master base station in addition to digital wireless signal data flow, in addition to other controls, management and operation maintenance data（Hereinafter referred to as band control signaling）, wherein control management category information includes link establishment and modification, speed between RRU and master base station The control signalings such as negotiation, data format and mode of operation negotiation, as noted previously, as present invention utilizes ripe SDH/OTN transmission technologys, the maintenance of transmission link and fault-tolerant grade are mainly completed by transmission network itself, therefore aforesaid operations maintenance（O＆M) category information is except link step-out, unsuccessfully etc. in addition to configured information, mainly RRU Operation and Maintenance information.

According to the present invention, because digital wireless signal data stream transmitting needs propagation delay time as small as possible, therefore utilize gfp frame structure by digital wireless signal data flow and its band control protocol mapping on STM-N/OTM-n frames, so as to realize the transmission based on SDH/OTN.Wherein, present invention eliminates the 8B/10B coding-decoding operations in GFP-T, and a variety of band control signalings and digital wireless signal data flow multiplexing scheme are proposed, so as to utilize identical transmission channel simultaneous transmission digital wireless signal data flow and its corresponding band control signaling.GFP most of design of hardware and software can be directly continued to use because the present invention is the extension of GFP agreements, therefore on implementing, difficulty is realized so as to greatly reduce.

1. digital wireless signal data flow and band control signal multiplex map with STM-N/OTM-n frames

1.1 utilize customer account management frame（CMF band control signaling) is transmitted

Fig. 4 diagrammatically illustrates the signal transmission plan between a kind of RRU based on the present invention and master base station.Specifically, Fig. 4 A, 4B are diagrammatically illustrated to be transmitted according to what first embodiment of the invention was carried out between master base station and one or more long-distance radio frequency units based on SDH/OTN, and the program sends band control signaling in GFP-T customer account managements frame (CMF) mode（Ρ Τ Ι=100), and be transmitted by appropriate scheduling using the idle bandwidth for the GFP-T client data frames for transmitting digital wireless signal data flow.Wherein the definition of existing GFP agreements is continued to use in UPI=00000001 and UPI=00000010, it is used for link step-out, the configured information such as unsuccessfully i.e. as shown in table 1,2, and the value retained between 00,000,011 11111110 can be used in the UPI for carrying the CMF frames of band control signaling, and, band control signaling can be decomposed into different control messages, and respectively Different UPI values are defined to make a distinction.

Remaining transmission bandwidth is effectively utilized using CMF frames transmission band control signaling, but in order to reduce the influence of receiving terminal digital wireless signal customer data stream clock recovery as far as possible, and effective controlling transmission time delay, according to the suggestion of GFP specifications, the payload of each CMF frames should be as small as possible（It typically should be less than 8 bytes）, user data frame than CMF frame have higher priority, i.e. CMF frames only client signal input Slow deposit close to space-time（Now need to fill character using 65BJPAD）Just sent, and single CMF frames can only be sent every time, in addition, the reliability in order to increase band control signaling, the error of transmission that payload FCS is provided to band control signaling can be used to protect.

As shown in Figure 4 A, digital wireless signal after transmitting terminal is sampled is after parallel-serial conversion, GFP-T client data frames are formed after being mapped as 64B/65B code blocks through 64B/65B coding units, because digital wireless signal data flow is not 8B/10B line coding streams, therefore each 64B/65B code blocks comprising 65BJPAD in addition to it may fill character, without other control characters.On the other hand, band control signaling flow also forms CMF frames（Also include being used for the defined CMF frames of the link step-out configured information such as unsuccessfully）As previously described, if and only if when needing to use 65B-PAD to fill character, single CMF frames can be sent in the gap of carrying digital wireless signal stream client data frame, gfp frame after multiplexing then can be according to existing technology-mapped on STM-N/OTM-n frames, so as to realize the transmission based on SDH/OTN.Wherein, according to SDH transmission, gfp frame after being then multiplexed is mapped as VC and re-forms STM-N frames first, the data rate of usual digital wireless signal is far above basic VC speed, therefore need to be by the way of concatenated in order or Virtual cascades, as it was previously stated, higher although with VCAT technology bandwidth availability ratios, but add propagation delay time, therefore the propagation delay time requirement of up-downgoing can not be met in some GSMs using fast power control technology.ODU (the Optical Channel Data Unit-k in OTN）Cascade there was only Virtual cascade systems, but because ODU speed is very high, therefore the ODU between RRU and master base station in transmission of wireless signals application without using Virtual Concatenation. As shown in Figure 4 B, receiving terminal first from STM-N/OTM-n frames isolate needed for VC/ODXJ (need certain Slow to deposit during as the VC using Virtual Concatenation and eliminate each VC transmission time delay difference）Extract its payload gfp frame, CMF frames and client data frame are isolated again, above-mentioned band control signaling flow is wherein obtained from CMF frames, then obtain 64B/65B code blocks first to client data frame, then digital wireless signal data flow is recovered by 64B/65B decoding units and serioparallel exchange unit.

1.2 transmit the scheme of band control signaling using control character

Fig. 5 gives another RRU based on the present invention and master base station signal transmission plan.Specifically, Fig. 5 A, 5B is diagrammatically illustrated to be transmitted according to what the embodiment of the mat woven of fine bamboo strips two of the present invention was carried out between master base station and one or more long-distance radio frequency units based on SDH/OTN, the program transmits band control signaling using 64B/65B code blocks control character position, as shown in Figure 5A, digital wireless signal after transmitting terminal is sampled is after parallel-serial conversion, GFP-T client data frames are formed after being mapped as 64B/65B code blocks through 64B/65B coding units, wherein 64B/65B code blocks are in addition to comprising digital wireless signal data character, also include two kinds of control characters, fill character and band control signaling flow character.Wherein band control signaling flow character is to enter 64B/65B coding units according to following dispatching method：When digital wireless signal data flow input Slow is deposited close to space-time, if band control signaling flow input Slow deposits not empty, enter 64B/65B coding units as control character, otherwise with filling of filling character.Receiving terminal is the inverse process of transmitting terminal, other similar to process shown in earlier figures 4B in addition to isolating digital wireless signal and band control signaling by 64B/65B decoding units, as shown in Figure 5 B.

As it was previously stated, control character only has low 4 to be used for transmission control code in 64B/65B code blocks in GFP specifications, and high 4 are used for the station location marker of the instruction of subsequent control character and control code in former 8B/10B code streams.Because the present invention is encoded without using 8B/10B, and control character is used to transmit band control signaling in addition to for filling character, therefore need to redefine the bit of control character.It is used as unrestricted exemplary example, figure 9 give a kind of definition of control character, wherein highest order b7 has continued to use the definition in former GFP specifications, it is used to indicate whether its subsequent byte is control character in the 64B/65B code blocks, b6 is used to indicate whether the control character is to fill character, b5/b4 is preserved for expanding in the future, and low 4 are used to transmit band control signaling flow.

1.3 are grouped band control signaling link layer the multiplexing scheme for being mapped as GFP-F frames

Fig. 6 gives another RRU based on the present invention and master base station signal transmission plan.Specifically, Fig. 6 A, 6B diagrammatically illustrate carried out according to third embodiment of the invention between master base station and one or more long-distance radio frequency units based on SDH/OTN transmission, the program takes the mode simultaneous transmission digital wireless signal data flow and band control signaling link layer Fen Group of gfp frame level multiplexing, i.e. as shown in Fig. 6 A, band control signaling link layer is grouped and is carried using the GP (GFP-F) of frame mapped mode and is used as another the independent client signal multiplexed with digital wireless signal data flow in GFP frame levels, and in fig. 6b, correspondingly digital wireless signal GFP-T frames and band control signaling GFP-F frames are demultiplexed, digital wireless signal data flow is recovered after being handled respectively through GFP-T frames and GFP-F frames and band control signaling link layer is grouped.Because digital wireless signal data flow and the packet of band control signaling link layer use the gfp frame of different mode, therefore above-mentioned two paths of data can be properly separated without other marks.

In order to solve because the packet of band control signaling link layer is larger and to digital wireless signal data stream transmitting time delay and the problem of having a negative impact of its clock recovery, according to the present invention, can take following measures：（1) less control signaling link layer packet is used, for example, can be by choosing less MTU（MTU) realize, i.e., by considering efficiency of transmission（The relative increase of the smaller packet header overheads of MTU causes efficiency of transmission to decline）Reduce above-mentioned adverse effect as far as possible to determine suitable MTU value；（2) in fig. 6 in the scheduling of shown gfp frame level multiplexing, prioritised transmission carrying numeral The GFP-T frames of wireless signal data flow, the GFP-F frames that carrying band control signaling link layer is grouped just are transmitted close to space-time when digital wireless signal data flow input Slow is deposited.

Band control protocol mapping is given another RRU based on the present invention and master base station signal transmission plan by 1.4 for multiplexing scheme Fig. 7 of GFP-T frames.Specifically, Fig. 7 A, 7B diagrammatically illustrate carried out according to four embodiment of the invention between master base station and one or more long-distance radio frequency units based on SDH/OTN transmission, the program takes the mode simultaneous transmission digital wireless signal data flow and band control signaling of gfp frame level multiplexing, i.e. as shown in Fig. 7 A, it regard band control signaling as another the independent client signal multiplexed with digital wireless signal data flow in GFP frame levels, and in Fig. 7 B, correspondingly digital wireless signal GFP-T frames and band control signaling GFP-T frames are demultiplexed, band control signaling and digital wireless signal are isolated after decoding respectively again, others send similar with aforementioned schemes with reception process.

In order to prevent the influence to the recovery of receiving terminal digital wireless signal data stream clock and reduce propagation delay time, according to the present invention, when taking the mode of gfp frame level multiplexing, the mode of fixed allocation is preferably taken in the scheduling of digital wireless signal GFP-T frames and band control signaling GFP-T frames, i.e. often transmission M (M >=l) individual digital wireless signal GFP-T frames are one band control signaling GFP-T frame of transmission, are filled if certain road input Slow rushes area's sky.In addition, as it was previously stated, GFP-T frame payload headers need increase extended head to provide channel logo（CID) support the multiplexing of multichannel client signal, that is, properly separate digital wireless signal data flow and the corresponding GFP-T frames of band control signaling.

1.5 digital wireless signal data flows give another RRU based on the present invention and master base station signal transmission plan with the time-multiplexed conceptual scheme 8 of band control signaling.Specifically, Fig. 8 A, 8B diagrammatically illustrate according to fifth embodiment of the invention carried out between master base station and one or more long-distance radio frequency units based on SDH/OT is transmitted, the program is by by numeral being client signal data flow all the way without halberd signal data stream and band control signal multiplex in a time-multiplexed mode of GFP-T frame ins, and being finally mapped into STM-N/OTM-n frames through the formation GIT-T frames of subsequent process shown in the Fig. 8 such as 64B/65B coding units A is transmitted.State a time-multiplexed mode of GFP-T frame ins in place, refer to the region that the client signal data block that the GFP-T frames of each fixed length are transmitted is divided into two fixed sizes, one is used to transmit digital wireless signal data flow, another is used to transmit band control signaling, why use and be time-multiplexed in a GFP-T frame in, it is because each GFP-T frames can provide the border of the data block of a multiplexing, so as to be to separate and extract respectively digital wireless signal data flow and band control signaling according to predetermined Time Division Multiplexing Fabric.Receiving terminal is the inverse process of transmitting terminal, other similar to process shown in earlier figures 4B except by finally by addition to dequantisation unit isolates digital wireless signal and band control signaling, as shown in Figure 8 B.Another sunset is foretold, due to not being continuous bit stream with interior sky signaling processed, therefore, if in each band control signaling transmission time, if no band control signaling data needs transmission, filled character and be filled using 65B_PAD.

2. clock recovery and RRU timings

In Service moves communication system, the frequency stability of base station radio unit requires higher, 0.05ppm precision is often reached, accordingly, it would be desirable in long-distance radio frequency unit（RRU) recover synchronous high stability clock signal, at the same between RRU and master base station digital wireless signal religion according to the transmission of stream to be also required to transmitting-receiving two-end clock synchronous.

Figure 10 gives clock recovery and RRU timing diagrams based on the present invention, wherein master base station uses the reference clock source of high stable, in addition to for the timing of the other units of master base station, in down direction, the reference clock source is provides timing with the module such as the GFP framing and VC/ODU of RRU wideband link interface transmitting terminal mapping, and RRU wideband links interface iSCSI receiving end is then using based on FIFO (push-up storages）PLL (the phased lock loops of seizure condition）Digital wireless signal data stream clock is recovered, and is somebody's turn to do Clock also serves as RRU reference frequency source simultaneously.In up direction, the modules such as GFP framing and the VC/ODU mapping of the transmitting terminal of wideband link interface RRU sides send data using this in the synchronised clock that down direction is obtained, and the receiving terminal of wideband link interface master base station side is then that gfp frame is decoded and the module such as VC/ODU demappings is provided regularly using above-mentioned reference clock source.In addition, the clock of the STM-N/OTM-n interfaces of transmitting-receiving two-end is directly extracted by SDH/OTN circuits, and without using above-mentioned customer data clock.

In addition, in the base station using radio frequency unit remote technology, RRU is without the processing and operation of radio frames, and its essence is to carry out the conversion that signal frequency is said, therefore RRU need not obtain the system frame timing information of master base station.

3. the link-layer technologies of band control signaling

In foregoing various transmission plans, the multiplexing scheme of GFP-F frames is mapped as except band control signaling link layer is grouped, other transmission plans, the scheme of band control signaling is transmitted using control character, the scheme of band control signaling is transmitted using control character, by the multiplexing scheme that band control protocol mapping is GFP-T frames, and digital wireless signal data flow and the time-multiplexed scheme of band control signaling, it all simply show the physical layer transmission method of band control signaling, although band control signaling flow can be extracted from digital wireless signal data flow, but each link layer packet can not be differentiated.

Therefore, according to the present invention, if the link layer packet of band control signaling is HDLC (High-Level Data Link Controls）Frame or ATM cell etc. have the structure of packet delimitative function, then can define corresponding HDLC frames or ATM cell using the characteristic of HDLC or ATM in itself；If structure or be directly that IP is grouped that the link layer packet of band control signaling is PPP, ethernet mac frame etc. without packet delimitative function, need to increase corresponding functional layer.Typically, PPP is grouped, HDLC or GFP-F framing can be passed through；IP is grouped, can be initially borne on PPP, HDLC or GFP-F framing is recycled；To ethernet mac frame, then using GFP-F framing. Logical Zhong combinations accompanying drawing is set forth to the method for transmitting signals and system of the wireless base station based on remote radio of the present invention above, but the present invention is not limited thereto., can various modification can be adapted, improves, without departing from the scope of appended claims of the present invention to the present invention one skilled in the art will appreciate that according to the principle of the invention.

Claims

1st, a kind of method that signal transmission is carried out between a master base station and one or more long-distance radio frequency units, transmission channel between wherein described master base station and one or more of long-distance radio frequency units is communicated using broadband transmission link or network, characterized in that, the described method comprises the following steps：

It is transmitted in the transmission channel using SDH SDH/ optical transfer networks OTN, and

The digital wireless signal data flow transmitted in the transmission channel and its band control signaling flow are formed as into Generic Framing Procedure GFP frames, and further it is mapped as STM-N/OTM-n frames, so as to be multiplexed the digital wireless signal data flow and the band control signaling flow, to realize the transmission based on SDH/OTN.

2nd, according to the method for transmitting signals of claim 1, it is characterised in that methods described further comprises the steps：

The digital wireless signal data flow is encoded, and the data manifold after coding is turned into GFP-T client's number Ju frame, wherein the GFP-T frames are the frame that block type of coding is supported defined in Generic Framing Procedure；

The band control signaling flow is formed as into GFP-T customer account management frames CMF;And

The single customer account management frame CMF is sent in the gap of the GFP-T client data frames formed, to be multiplexed the digital wireless signal data flow and the band control signaling flow in gfp frame level.

3rd, according to the method for transmitting signals of claim 2, it is characterised in that before being encoded to the digital wireless signal data flow, parallel-serial conversion is carried out to the digital wireless signal.

4th, method for transmitting signals according to claim 2, it is characterised in that after GFP frame levels are multiplexed the digital wireless signal data flow and the band control signaling flow, Methods described further comprises the steps：

The mode cascaded using concatenated in order or Virtual, is mapped as Virtual containers VC by the gfp frame after multiplexing and re-mapped as STM-N frames first；Or

The gfp frame after multiplexing is directly mapped as OTM-n frames using Optical Channel Data Unit-k ODU.

5th, method for transmitting signals according to claim 2, it is characterised in that also include：The gfp frame is extracted from the STM-N/OTM-n frames received；And by the gfp frame extracted be demultiplexed, with isolate GFP-T client data frames and

GFP-T customer account management frame CMF, to recover the band control signaling from the GFP-T customer account management frames isolated, and decode, then recover the digital wireless signal first to the GF-T client data frames isolated.

6th, according to the method for transmitting signals of claim 5, it is characterised in that described the gfp frame Bu Sudden are extracted from the STM-N/OTM-n frames received to further comprise：

The STM-N/OTM-n frames received progress Virtual Concatenation Slow is deposited.

7th, according to the method for transmitting signals of claim 5, it is characterised in that further comprise：Serioparallel exchange will be carried out by decoded digital wireless signal.

8th, according to the method for transmitting signals of claim 2, it is characterised in that the GFP-T client data frames are transmitted using the priority higher than the GFP-T customer account managements frame CMF.

9th, according to the method for transmitting signals of claim 2, it is characterised in that the error of transmission provided using payload Frame Check Sequence to the band control signaling is protected.

10th, method for transmitting signals according to claim 2, it is characterised in that methods described further comprises：

If the link layer Fen Group of the band control signaling are High-Level Data Link Control HDLC frames or ATM cell, corresponding HDLC frames or ATM cell comprising the band control signaling are defined using HDLC or ATM packet delimitative function； If the link layer packet of the band control signaling is peer-peer protocol PPP packets, the packet of Ethernet media access control MAC or is directly IP packets：Then it is grouped for PPP, HDLC or GFP-F framing can be passed through；IP is grouped, can be initially borne on PPP, HDLC or GFP-F prestige frames are recycled；And to ethernet mac frame, then using GFP-F framing.

11st, method for transmitting signals according to claim 1, it is characterised in that methods described further comprises the steps：

The digital wireless signal is encoded；Control signaling；And

Encoded and with the band control signaling the digital wireless signal data manifold is turned into GFP-T frames.

12nd, according to the method for transmitting signals of claim 11, it is characterised in that before being encoded to the digital wireless signal, parallel-serial conversion is carried out to the digital wireless signal.

13rd, according to the method for transmitting signals of claim 11, it is characterised in that after the GFP-T frames are formed, methods described further comprises the steps：

The mode cascaded using concatenated in order or Virtual, is mapped as Virtual containers VC by the GFP-T frames and re-mapped as STM-N frames first；Or

The GFP-T frames are directly mapped as OTM-n frames using Optical Channel Data Unit-k ODU.

14th, the blunt method for transmitting signals according to claim 11 of, it is characterised in that also include：

The GFP-T frames are extracted from the STM-N/OTM-n frames received；Solution stone horse is carried out to the GFP-T frames extracted；And

The band control signaling and the digital wireless signal are recovered from decoded GFP-T frames. 15th, according to the method for transmitting signals of claim 14, it is characterised in that described to further comprise the step of the GFP-T frames are extracted from the STM-N/OTM-n frames received：

The STM-N/OTM-n frames received progress Virtual Concatenation Slow is deposited.

16th, according to the method for transmitting signals of claim 14, it is characterised in that further comprise：Serioparallel exchange is carried out to the digital wireless signal recovered.

17th, according to the method for transmitting signals of claim 11, it is characterised in that the control character in the coding code block is defined as：

Highest order b7 is used to indicate whether its subsequent byte to be control character in the coding code block；

An ensuing b6 is used to indicate whether the control character is to fill character；Last two b5/b4 in Gao Siwei are preserved for expanding in the future；And low four be used for transmit the band control signaling flow.

18th, according to the method for transmitting signals of claim 11, it is characterised in that methods described further comprises：

If the link layer packet of the band control signaling is High-Level Data Link Control HDLC frames or ATM cell, corresponding HDLC frames or ATM cell comprising the band control signaling are defined using HDLC or ATM packet delimitative function；If the link layer of the band control signaling point chain is peer-peer protocol PPP packets, the packet of Ethernet media access control MAC or is directly IP packets：Then it is grouped for PPP, HDLC or GFP-F framing can be passed through；It to IP Fen Group, can be initially borne on PPP, recycle HDLC or GFP-F framing；And to ethernet mac frame, then using GFP-F framing.

19th, method for transmitting signals according to claim 1, it is characterised in that methods described further comprises the steps：

The band control signaling is formed as into GFP-F frames, wherein, the GFP-F frames are the frame of supported protocol data cell PDU types defined in Generic Framing Procedure； The digital wireless signal data flow is encoded, and the digital wireless signal data manifold after coding is turned into GFP-T frames；

The GFP-F frames formed and the GFP-T frames formed are carried out into gfp frame level to multiplex.

20th, according to the method for transmitting signals of claim 19, it is characterised in that to be confused religion word wireless signal data flow encode before, to the digital wireless signal progress parallel-serial conversion.

21st, according to the method for transmitting signals of claim 19, it is characterised in that after the GFP-F frames formed and the GFP-T frames formed progress gfp frame level multiplexing, methods described further comprises the steps：

The mode cascaded using concatenated in order or Virtual, is mapped as Virtual containers VC by be confused gfp frame and re-mapped as STM-N frames first；Or

The GFP frames are directly mapped as OTML-n frames using Optical Channel Data Unit-k ODU.

22nd, according to the method for transmitting signals of claim 19, it is characterised in that also include：

The gfp frame is extracted from the STM-N/OTM-n frames received；And the gfp frame extracted is demultiplexed, to isolate GFP-F frames and GFP-T frames, to recover the band control signaling from the GIT-F frames isolated, and the GFP-T frames isolated are decoded first, then recover liver and state digital wireless signal.

23rd, according to the method for transmitting signals of claim 22, it is characterised in that described from meeting ^：To STM-N/OTM-n frames in extract the gfp frame the step of further comprise：

The STM-N/OTM-n frames received progress Virtual Concatenation Slow is deposited.

24th, according to the method for transmitting signals of claim 22, it is characterised in that further comprise：Decoded digital wireless signal is subjected to serioparallel exchange.

25th, the good method for transmitting signals according to claim 19 of, it is characterised in that to subtract Less because band control signaling link layer is grouped adverse effect that is larger and being produced to digital wireless signal data stream transmitting time delay and its clock recovery, methods described at least uses any one following mode：

I) less MTU is chosen to realize less control signaling link layer packet；

Ii) in gfp frame level multiplexing, prioritised transmission carries the GFP-T frames of digital wireless signal data flow.

26th, method for transmitting signals according to claim 1, it is characterised in that methods described further comprises：

The band control signaling flow is encoded and is formed as the first GFP-T client data frames；

The digital wireless signal data flow is encoded and is formed as the 2nd GFP-T client data frames；

The first GFP-T client data frames and the GFP-T client data frames of the mat woven of fine bamboo strips two are carried out into gfp frame level to be multiplexed.

27th, according to the method for transmitting signals of claim 26, it is characterised in that before being encoded to the digital wireless signal data flow, parallel-serial conversion is carried out to the digital wireless signal.

28th, according to the method for transmitting signals of claim 26, it is characterised in that methods described further comprises：

The mode cascaded using concatenated in order or Virtual, is mapped as Virtual containers VC by the gfp frame after multiplexing and re-mapped as STM-N frames first；Or

The gfp frame after multiplexing is directly mapped as OTM-n frames using Optical Channel Data Unit-k ODU.

29th, according to the method for transmitting signals of claim 26, it is characterised in that also include：

The gfp frame is extracted from the STM-N/OTM-n frames received；And By the gfp frame extracted demultiplexing, and the objective data frames of the first GFP-T obtained after demultiplexing and the 2nd GFP-T client data frames are decoded respectively, to recover the band control signaling and the digital wireless signal respectively.

30th, the blunt method for transmitting signals according to claim 29, it is characterised in that described the gfp frame Bu Sudden are extracted from the STM-N/OTM-n frames received to further comprise：

* will be met | zhang to STM-N/OTM-n frames carry out Virtual Concatenation Slow deposit.

31st, according to the method for transmitting signals of claim 29, it is characterised in that further comprise：Serioparallel exchange will be carried out by decoded digital wireless signal.

32nd, the blunt method for transmitting signals according to claim 26 in, it is characterized in that, the first GFP- T client data frames and the 2nd GFP-T client data frames take the mode of fixed allocation, and provide channel logo by increasing extended head, to carry out GFP frame level multiplexings.

33rd, according to the method for transmitting signals of claim 26, it is characterised in that methods described further comprises：

If the link layer packet of the band control signaling is High-Level Data Link Control HDLC frames or ATM cell, the corresponding HDLC frames or ATM cell of the bag house band control signaling are defined using HDLC or ATM packet delimitative function；If the link layer packet of the band control signaling is peer-peer protocol PPP Fen Group, the packet of Ethernet media access control MAC or is directly IP packets：Then it is grouped for PPP, HDLC or GFP-F framing can be passed through；IP is grouped, can be initially borne on PPP, HDLC or GFP-F framing is recycled；And to ethernet mac frame, then using GFP-F framing.

34th, ^^ according to claim 1 method for transmitting signals, it is characterised in that

In the present GFP-T frame ins time division multiplexing digital wireless signal data flow and the band control signaling flow；

The data flow obtained after time division multiplexing is encoded and is formed as GFP-T client Data frame.

35th, according to the method for transmitting signals of claim 34, it is characterised in that before being time-multiplexed to the digital wireless signal data flow and the band control signaling, the digital wireless signal carries out parallel-serial conversion.

36th, according to the method for transmitting signals of claim 34, it is characterised in that methods described further comprises：

Using concatenated in order or the mode of Virtual Concatenation, the GFP-T frames are mapped as Virtual containers VC first and re-mapped as STM-N frames；Or

The GFP-T frames are directly mapped as OTM-n frames using Optical Channel Data Unit-k ODU.

37th, according to the method for transmitting signals of claim 34, it is characterised in that methods described, which is confused a step, to be included：

GF-T the frames are extracted from the STM-N/OTM-n frames received；The GFP-T frames extracted are decoded；And

Decoded GFP-T frames demultiplexing is obtained, to recover the band control signaling and institute's digital wireless signal.

38th, just the blunt method for transmitting signals according to claim 37, it is characterised in that it is described from connect t to STM-N/OTM-n frames in extract the GFP-T frames the step of further wrap Homes：

The STM-N/OTM-n frames received progress Virtual Concatenation Slow is deposited.

39th, according to the method for transmitting signals of claim 37, it is characterised in that further wrap Homes：The digital wireless signal obtained after demultiplexing is subjected to serioparallel exchange.

40th, according to the method for transmitting signals of claim 34, it is characterised in that methods described：The steps of ^ mono- include：

If the link layer packet of the band control signaling is High-Level Data Link Control HDLC frames or ATM cell, the corresponding HDLC frames or ATM cell of the band control signaling are included come boundary using HDLC or ATM Fen Group delimitative functions； If the link layer packet of the band control signaling is peer-peer protocol FPP Fen Group, Ethernet media when meeting people control MAC Fen Group or being directly that IP is grouped：Then for PPP Fen Group, HDLC or GFP-F framing can be passed through；IP is grouped, can be initially borne on PPP, HDLC or GFP-F framing is recycled；And to ethernet mac frame, then using GFP-F framing.

41st, the method for transmitting signals of any one in 1-40 is required according to profit, it is characterised in that the side,;Also include：

Encoded using 64B/65B code blocks；And

Correspondingly, decoded using the 64B/65B code blocks.

42nd, the method for transmitting signals of any one in 1-40 is required according to profit, it is characterised in that the side also includes：

On the downlink direction of master base station to long-distance radio frequency unit：

By the reference clock source of master base station timing is provided for the GFP framing and VC/ODU mapping blocks of the LI(link interface) transmitting terminal；And

The digital wireless signal data stream clock is recovered using the phase-locked loop Lip river based on push-up storage seizure condition in the LI(link interface) receiving terminal, and assign the clock as the reference frequency source of institute's long-distance radio frequency unit simultaneously；

On the uplink direction of long-distance radio frequency unit to master base station：

The GFP framing and VC/ODU mapping blocks of the LI(link interface) transmitting terminal use the synchronised clock obtained in down direction to send data；

Then decoded in the LI(link interface) receiving terminal using the reference clock source for gfp frame and VC/ODU demapping modules provide timing.

43rd, a kind of base that signal transmission is carried out between a master base station and one or more long-distance radio frequency units is stained with communication system, wherein described master base station is communicated with the id of one or more of long-distance radio frequency units transmission channel using broadband transmission link or network, at least include characterized in that, liver states base station communication system：

One SDH SDH/ optical transfer network OTN communication interface, is arranged on institute State in transmission channel, for the digital wireless signal transmitted in the transmission channel data flow and its band control signaling flow to be formed as into Generic Framing Procedure gfp frame, and further it is mapped as STM-N/OTM-n frames, so as to be multiplexed the digital wireless signal number Ju stream and the band control signaling flow, to realize the transmission based on SDH/OTN.

44th, according to the base station communication system of claim 43, it is characterised in that the system further comprises：

Coding unit, for being encoded to the digital wireless signal data flow；Client data frame frame unit, for the data manifold after coding to be turned into GFP-T client data frames, wherein the GIT-T frames are the frame that block type of coding is supported defined in Generic Framing Procedure；

Customer account management frame CMF frame units, for the band control signaling flow to be formed as into GFP-T customer account management frames CMF;And

Frame Multiplexing Unit, for sending the single customer account management frame CMF in the gap of the GFP-T client data frames formed, to be multiplexed several space wireless signal data flows and the band control signaling flow in gfp frame level.

45th, according to the base station communication system of claim 44, it is characterised in that the system further comprises：

Parallel serial conversion unit, is connected with the coding unit, for before being encoded to the digital wireless signal data flow, parallel-serial conversion to be carried out to the digital wireless signal.

46th, according to the base station communication system of claim 44, it is characterised in that the system further comprises：

Mapping/concatenation unit, is connected with the frame Multiplexing Unit, for the mode using hectare sequence cascade or Virtual Concatenation, the GFP-T frames after multiplexing is mapped as into virtual container VC first and re-mapped as STM-N frames；Or the GFP-T frames after multiplexing are directly mapped as OTM-n frames using Optical Channel Data Unit-k ODU.

47th, according to the base station communication system of claim 44, it is characterised in that the system further comprises： Frame removes multiple moon unit, is demultiplexed for extracting the gfp frame from the STM-N/OTM-n frames received, and by the gfp frame extracted, to isolate GIT-T client data frames and GFP-T customer account management frames；

CMF processing units, are connected with the dequantisation unit, for recovering the band control signaling from the objective management frames of the GFP-T isolated；

GFP-T frame processing units, are connected with the frame dequantisation unit, the digital wireless signal for recovering coding from the GFP-T client data frames isolated；And

Decoding is single, is connected with the GFP-T frame processing units, for being decoded to the GFP-T client data frames, to recover the digital wireless signal.

48th, according to the base station communication system of claim 47, it is characterised in that the system further comprises：

Virtual Concatenation Slow memory cells, for the STM-N/OTM-n received frames progress Virtual Concatenation Slow to be deposited.

49th, according to the base station communication system of claim 47, it is characterised in that the system further comprises：

Serioparallel exchange unit, is connected with the decoding unit, for that will carry out serioparallel exchange by decoded digital wireless signal.

50th, according to the base station communication system of claim 43, it is characterised in that the system further comprises：

Coding unit, for being encoded to the digital wireless signal；

Scheduling unit, is connected with the coding unit, for transmitting the band control signaling using the control character in used coding code block when encoding；And

Frame forms inferior member, for by encoded cell encoding and with the band control signaling the digital wireless signal data manifold turn into GFP-T frames.

51st, according to the base station communication system of claim 50, it is characterised in that the system further comprises：

Parallel serial conversion unit, is connected with the scheduling unit, for the digital radio Signal carries out parallel-serial conversion.

52nd, according to the base station communication system of claim 50, its feature is in Chu, and the system further comprises：

Mapping/concatenation unit, is connected with frame formation unit, for the mode cascaded using concatenated in order or Virtual, the GFP-T frames is mapped as into Virtual containers VC first and re-mapped as STM-N frames；Or the GFP-T frames are directly mapped as Ο Τ Γ Μ-η frames using Optical Channel Data Unit-k ODU.

53rd, according to the base station communication system of claim 50, it is characterised in that the system further comprises：

Frame processing unit, for extracting the GFP-T frames from the STM-N/OTM-n frames received；

Decoding unit, states frame processing unit with liver and is connected, for being decoded to the GFP-T frames extracted；And

Separative element, is connected with the decoding unit, for recovering the band control signaling and the digital wireless signal from decoded GFP-T frames.

54th, according to the base station communication system of claim 53, it is characterised in that the system further comprises：

Virtual cascades Slow memory cells, is deposited for the STM-N/OTM-n received frames to be carried out into Virtual cascades Slow.

55th, according to the base station communication system of claim 53, its feature is in Chu, and the system further comprises：

Serioparallel exchange unit, is connected with the decoding unit, is changed for the digital wireless signal for recovering iti to be gone here and there and earned.

56th, according to the base station communication system of claim 43, it is characterised in that the system further comprises：

The frame of the mat woven of fine bamboo strips one formation unit, for the band control signaling to be formed as into GFP-F frames, wherein, the GFP-F frames are supported protocol data defined in Generic Framing Procedure Unit PDU types ^/frame；

Coding unit, for being encoded to the digital wireless signal data flow；Second frame formation unit, is connected with the coding unit, and GFP-T frames are turned into for will compile the digital wireless signal data manifold after ^ horses；And

Frame Multiplexing Unit, is multiplexed for the GFP-F formed frames and the GFP-T frames formed to be carried out into gfp frame level.

57th, according to the base station communication system of claim 56, it is characterised in that the system further comprises：

Parallel-serial conversion lifts member, is connected with the coding unit, for the digital wireless signal to be carried out and exchanged.

58th, according to the base station communication system of claim 56, it is characterised in that the system further comprises：

The inferior member of mapping/cascade, is connected with the frame Multiplexing Unit, for using concatenated in order or Virtual Concatenation;^ formulas, are mapped as virtual container VC by the gfp frame and re-map as STM-N frames first；Or the GFP frames are directly mapped as OTM-n frames using Optical Channel Data Unit-k ODU.

59th, according to the base station communication system of claim 56, it is characterised in that the further Bao Ting of system：

Frame demultiplexing lifts member, and gfp frame is confused for being extracted from the STM-N/OTM-n frames received；And the gfp frame extracted is demultiplexed, to isolate GFP-F frames and GFP-T frames；

First frame processing unit, is connected with the frame dequantisation unit, for from the GFP-F frames isolated ' the multiple band control signaling；

Second frame processing unit, is connected with the frame dequantisation unit, for exports coding digital wireless signal；And

Decoding unit, is connected with the frame processing unit of the mat woven of fine bamboo strips two, is decoded to recover the digital wireless signal for the coding digital wireless signal to defeated i ± J. 60th, the base station communication system of claim 59 is occupied, it is characterised in that the system further comprises：

Virtual cascades Slow memory cells, is deposited for the STM-N/OTM-n received frames to be carried out into Virtual cascades Slow.

61st, the blunt base station communication system according to claim 59 of, it is characterised in that the system further comprises：

String hand converting unit, is connected with the decoding unit, for decoded digital wireless signal to be carried out into serioparallel exchange.

62nd, the blunt base station communication system according to claim 43 of, it is characterised in that the system further comprises：

First coding unit, for being encoded to the band control signaling flow；First frame formation unit, is connected with first coding unit, for the band control signaling after coding to be formed as into the first GFP-T client data frames；

Second coding unit, for being encoded to the digital wireless signal data, stream；Second frame formation unit, is connected with second coding unit, for the digital wireless signal after coding to be formed as into the 2nd GFP-T client data frames；

Frame Multiplexing Unit, is connected with first frame formation unit and second frame formation unit, is multiplexed for the first GFP-T client data frames and the 2nd GFP-T client data frames to be carried out into gfp frame level.

63rd, the blunt base station communication system according to claim 62 of, it is characterised in that the system further comprises：

And converting unit, it is connected with second coding unit, for carrying out parallel-serial conversion to the digital wireless signal.

64th, the base station communication system of claim 62 is occupied, it is characterised in that the system further comprises：

Mapping/concatenation unit, is connected with the frame Multiplexing Unit, and with Chu using concatenated in order or the mode of Virtual Concatenation, the gfp frame after multiplexing is mapped as into Virtual containers VC first again It is mapped as STM- N frames；Or directly reflected the gfp frame after multiplexing for OTM-n frames using Optical Channel Data Unit-k ODIJ.

65th, according to the base station communication system of claim 62, it, which relies on to levy, is, the system further comprises：

Frame removes multiple moon unit, for extracting the gfp frame from the STM-N/OTlM-n frames received and the gfp frame extracted being demultiplexed；

First frame processing unit, is connected with the frame dequantisation unit, for handling the first GFP-T client data frames for including band control signaling；

First solution;5 horse units, are connected with first frame processing unit, are decoded for the output to first frame processing unit, to isolate the band ^ control signalings；Second frame processing unit, is connected with the frame dequantisation unit, for handling the 2nd GFP-T client data frames for including digital wireless signal；

Second decoding unit, is connected with second frame processing unit, is decoded for the output to second frame processing unit, to isolate several taro wireless signals.

66th, according to the base station communication system of claim 65, it is characterised in that the system further comprises：

Virtual Concatenation helps memory cell, for the STM-N/OTM-n received frames progress Virtual Concatenation Slow to be deposited.

67th, according to the base station communication system of claim 65, it, which relies on to levy, is, the system further comprises：

Serioparallel exchange unit, is connected with second decoding unit, for that will carry out serioparallel exchange by decoded digital wireless signal.

68th, according to the base station communication system of claim 43, it, which relies on to levy, is, the system further comprises：

Time-division multiple moon unit, in a GFP-T frame ins time division multiplexing digital wireless signal data flow and the band control signaling flow；

Coding is single, is connected with the time-division multiplexing unit, for being obtained after time division multiplexing To data flow encoded；And

Frame formation unit, is connected with the coding unit, and the data manifold obtained after coding is turned into GFP-T client data frames with Chu.

69th, according to the base station communication system of claim 68, it is characterised in that the system further comprises：

Parallel serial conversion unit, is connected with the time-division multiplexing unit, for carrying out parallel-serial conversion to the digital wireless signal.

70th, according to the base station communication system of claim 68, it is characterised in that the system further comprises：

Mapping/concatenation unit, is connected with frame formation unit, is re-mapped for the GFP-T frames to be mapped as into virtual container VC first as STM-N frames；Or the GFP-T frames are directly mapped as OTM-n frames using Optical Channel Data Unit-k ODU.

71st, according to the base station communication system of claim 68, it is characterised in that the system further comprises：

Frame processing unit, for extracting the GFP-T j from the STM-N/OTM-n frames received;

Decoding unit, for being decoded to the GFP-T frames extracted；And dequantisation unit, for decoded GFP-T frames to be demultiplexed, to recover the band control signaling and the digital wireless signal.

72nd, according to the base station communication system of claim 71, it is characterised in that the system further comprises：

Virtual cascades Slow memory cells, for the STM-N/OTM-n received frames progress Virtual Concatenation Slow to be deposited.

73rd, according to the base station communication system of claim 71, it is characterised in that the system further comprises：

Serioparallel exchange unit, is connected with the dequantisation unit, and the digital wireless signal for will be obtained after demultiplexing carries out serioparallel exchange. 74th, according to the claim 43-73 base station communication systems of any one, its feature in f,

The coding unit carries out Knitting codes using 64B/65B code blocks；And

Correspondingly, the decoding unit is decoded using the 64B/65B code blocks.

75th, is according to the claim 43-73 base station communication systems of any one, and its feature includes a base station reference clock source in f in the master base station, and lifting member in the remote radio frequency includes a clock recovery phased lock loop, wherein：

On the downlink direction of master base station to long-distance radio frequency unit：

The master base station reference clock source, timing is provided for the GFP for the LI(link interface) transmitting terminal into Flag and VC/ODU mapping blocks；And

The clock recovery phased lock loop, in the LI(link interface) receiving terminal, for recovering the digital wireless signal data stream clock, and using the clock simultaneously as the reference frequency source of the long-distance radio frequency unit, wherein the clock ' the multiple phased lock loops of Shaanxi are to use the phased lock loop based on push-up storage seizure condition；

On the up-link side ^ of long-distance radio frequency unit to master base station：

The clock recovery phased lock loop, for for the LI(link interface) transmitting terminal

GFP framing and VC/ODU mapping blocks provide the synchronised clock in down direction acquisition to carry out data transmission；

The master base station reference clock source, for being that GFT frame decodings and VC/ODU demapping modules provide timing in the LI(link interface) receiving terminal.